tm 

The trademark (<<keyword>tm</keyword>>) element in DITA is used
to markup and identify a term or phrase that is trademarked. Trademarks include
registered trademarks, service marks, slogans and logos.

Element Information

Model

(tm)
Children: tm

Attributes

QName Type Fixed Default Use Inheritable Annotation
audience xs:string optional
base xs:string optional
class xs:string - topic/tm optional 
The class attribute supports specialization. Its predefined values help 
the output transforms work correctly with ranges of related content.
conref xs:string optional
id xs:NMTOKEN optional
importance importance-atts.class optional
otherprops xs:string optional
platform xs:string optional
product xs:string optional
props xs:string optional
rev xs:string optional
status status-atts.class optional
tmclass xs:string optional
tmowner xs:string optional
tmtype type-tmtype-att.class required
trademark xs:string optional
translate yesno-att.class optional
xml:lang xs:language optional 
In due course, we should install the relevant ISO 2- and 3-letter
codes as the enumerated possible values . . .
xtrc xs:string optional
xtrf xs:string optional

Used By

Element Group tm

Source 

<xs:element name="tm">
  <xs:annotation>
    <xs:documentation>The trademark (<
      <keyword>tm</keyword>>) element in DITA is used to markup and identify a term or phrase that is trademarked. Trademarks include registered trademarks, service marks, slogans and logos.</xs:documentation>
  </xs:annotation>
  <xs:complexType mixed="true">
    <xs:complexContent>
      <xs:extension base="tm.class">
        <xs:attribute ref="class" default="- topic/tm "/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

Sample